Gas Mileage Calculator

Miles and MPG in, gas cost out.

FREE · NO SIGN-UP · RUNS ON YOUR DEVICE

Your numbers stay on your device

Specification

Gas Mileage Calculator at a glance

How to

Questions

Divide the miles driven between two fills by the gallons the second fill took. The trip computer usually shows it too.

It varies widely by vehicle. Small cars often sit near thirty-five, larger trucks nearer eighteen, and the figure drops in town.

Yes. Ticking it doubles the miles, so the gallons and the cost double with them.

Yes. Switch the units and enter litres per hundred kilometres. Everything else on the panel works the same way.

Background

Set the units to miles and gallons, enter the trip length, your MPG and the price per gallon. The gallons used and the cost appear together.

Two full tanks and the miles between them give a truer MPG than a single trip computer reading.
Highway mileage usually beats town mileage, so a mixed trip lands between the two figures.
Tyre pressure, roof loads and air conditioning all cost measurable miles per gallon.
Gas prices differ enough between states that a route can change the cost more than the driving does.

Specification of the Gas Mileage Calculator tool
Units	Miles with miles per gallon, or kilometres with litres per hundred.
Round trip	One tick doubles the miles and everything that follows from it.
Gallons used	Shown alongside the cost, so the pump reading can be checked.
Splitting	Any number of riders. Each share is shown once there is more than one.
Currency	None assumed. Enter the price per gallon in whatever you pay.
Price	Free. Supported by clearly labelled ads placed outside the working area.
Account required	No.
Where it runs	In your browser tab. Nothing is sent anywhere.

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